/*
 * Copyright (C) 2010 Yury Kudryashov.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package name.kudryashov.concurrent;

import name.kudryashov.base.Argument;

import java.util.concurrent.locks.Condition;

public class ConditionFlag {
    private final Condition condition;
    private boolean flag;

    public ConditionFlag(Condition condition, boolean flag) {
        this.flag = flag;
        this.condition = Argument.requireNotNull(condition, "condition");
    }

    public void waitForFlag() throws InterruptedException {
        while(!flag) {
            condition.await();
        }
    }

    public void setFlag() {
        flag = true;
        // TODO if many threads wait for the flag, how many need to pass?
        condition.signalAll();
    }

    public void clearFlag() {
        flag = false;
    }
}